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Avalanche Forecast

Archived

Apr 6th, 2025–Apr 7th, 2025

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Lizard-Flathead, Flathead, Lizard, Crawford, Moyie, St. Mary.

Head to high north facing slopes to find the best conditions.

Wet loose avalanches remain possible with warm temperatures and light rain.

Confidence

Moderate

Avalanche Summary

On Saturday, avalanches were observed to size 1.

On Monday, activity is expected to be limited to small, wet avalanches on steep slopes.

Snowpack Summary

Light snow or rain will fall over either a thin crust or moist snow to 2500 m. High alpine north-facing slopes may still hold dry snow above a thick crust from late March.

The mid and lower snowpack are generally well settled.

Weather Summary

Sunday Night

Cloudy with 10 to 30 km/h southwest ridgetop wind. Freezing level remains above 2500 m.

Monday

Cloudy with 5 to 10 mm of wet snow or rain. 30 to 50 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level lowers to 2000 m over the day.

Tuesday

Up to 10 cm of wet snow or rain overnight.

Cloudy with 5 cm of snow above 1600 m. 20 to 30 km/h southwest ridgetop wind. Treeline temperature -2 °C.

Wednesday

Mostly cloudy with flurries. 20 to 30 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level 2000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Cornices often break further back than expected; give them a wide berth when traveling on ridgetops.
  • Rocks will heat up with daytime warming and may become trigger points for loose wet avalanches.
  • A moist or wet snow surface, pinwheeling, and natural avalanches are all indicators of a weakening snowpack.

Problems

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.